/* ==========================================================================
   KAIYUN — shared site layer (/assets/site.css)
   夜间球场指挥台：深墨绿结构色 + 荧光青柠索引 + 暖橙状态 + 冰青数据
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

html.nav-open { overflow: hidden; }

body,
h1, h2, h3, h4,
p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; padding: 0; }

ul, ol { list-style: none; }

img, svg, video { display: block; max-width: 100%; }

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; text-decoration: none; }

[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #071B16;
  --ink-2: #0E2A23;
  --ink-3: #123329;
  --steel: #8C9A94;
  --paper: #F2F6F1;
  --lime: #B8FF3D;
  --lime-dark: #7FBF1F;
  --orange: #FF9B4A;
  --ice: #59E0C8;
  --alert: #E15B4A;

  --line: rgba(140, 154, 148, .26);
  --line-soft: rgba(140, 154, 148, .14);
  --lime-ghost: rgba(184, 255, 61, .10);
  --paper-70: rgba(242, 246, 241, .72);

  --font-display: "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-body: var(--font-display);
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --fs-display: clamp(2.5rem, 6vw, 5rem);
  --fs-h2: clamp(1.75rem, 3.2vw, 2.6rem);
  --fs-h3: clamp(1.05rem, 1.6vw, 1.3rem);
  --fs-body: clamp(0.95rem, 1.05vw, 1.0625rem);
  --fs-note: 0.8125rem;
  --fs-micro: 0.6875rem;

  --wrap-max: 1320px;
  --gutter: clamp(1.15rem, 4vw, 3rem);
  --radius: 2px;
  --ease: cubic-bezier(.22, .7, .28, 1);
  --shadow: 0 18px 48px rgba(0, 0, 0, .45);
}

/* ---------- 3. 中文排版基底 ---------- */
body {
  background-color: var(--ink);
  background-image:
    radial-gradient(70vw 55vh at 88% -8%, rgba(184, 255, 61, .075), transparent 68%),
    radial-gradient(55vw 45vh at 2% 4%, rgba(89, 224, 200, .06), transparent 70%);
  background-repeat: no-repeat;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.75;
  letter-spacing: .012em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .06em;
}

p { text-wrap: pretty; }

strong { font-weight: 700; color: var(--paper); }

::selection { background: var(--lime); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 4. 布局工具 ---------- */
.wrap {
  width: min(var(--wrap-max), 100% - var(--gutter) * 2);
  margin-inline: auto;
}

.grid {
  display: grid;
  gap: clamp(1rem, 2.4vw, 2rem);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }

.rule {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 5. Skip link ---------- */
.skip-link {
  position: fixed;
  top: .75rem;
  left: .75rem;
  z-index: 300;
  transform: translateY(-260%);
  background: var(--lime);
  color: var(--ink);
  padding: .7rem 1.1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .14em;
  font-weight: 700;
  border-radius: var(--radius);
  transition: transform .18s var(--ease);
}

.skip-link:focus { transform: translateY(0); }

/* ---------- 6. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(7, 27, 22, .94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  transition: background .2s linear, box-shadow .2s linear;
}

.site-header.is-scrolled {
  background: rgba(7, 27, 22, .99);
  box-shadow: 0 14px 36px rgba(0, 0, 0, .5);
}

.header-ticker {
  background: var(--ink-2);
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--steel);
}

.ticker-inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .45rem .9rem;
  min-height: 32px;
  padding-block: .3rem;
}

.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  white-space: nowrap;
}

.ticker-item--mono { letter-spacing: .2em; color: rgba(140, 154, 148, .8); }

.ticker-item--right {
  margin-left: auto;
  color: var(--lime-dark);
  letter-spacing: .24em;
}

.ticker-sep {
  width: 1px;
  height: 10px;
  background: var(--line);
  display: inline-block;
}

.dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
}

.dot--live {
  background: var(--orange);
  box-shadow: 0 0 0 0 rgba(255, 155, 74, .6);
  animation: statusPulse 2.8s ease-out infinite;
}

@keyframes statusPulse {
  0%   { box-shadow: 0 0 0 0 rgba(255, 155, 74, .55); }
  70%  { box-shadow: 0 0 0 9px rgba(255, 155, 74, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 155, 74, 0); }
}

.header-bar {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.4vw, 2.5rem);
  min-height: 78px;
}

/* 品牌锁标 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  flex: 0 0 auto;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .02em;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  transition: background .18s linear, transform .18s var(--ease);
}

.brand:hover .brand-mark {
  background: var(--ice);
  transform: translateY(-1px);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: .18rem;
  line-height: 1;
}

.brand-name {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--paper);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: .5625rem;
  letter-spacing: .3em;
  color: var(--steel);
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  margin-left: auto;
  padding: .55rem .7rem;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .16em;
  cursor: pointer;
  transition: border-color .18s linear, color .18s linear;
}

.nav-toggle:hover { border-color: var(--lime); color: var(--lime); }

.nav-toggle-icon {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--paper);
  transition: transform .18s var(--ease), opacity .18s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(2.75px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  transform: translateY(-2.75px) rotate(-45deg);
}

/* 主导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(.75rem, 2vw, 2rem);
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(.35rem, 1.4vw, 1.5rem);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: .55rem .15rem;
  font-size: .9rem;
  letter-spacing: .08em;
  color: rgba(242, 246, 241, .78);
  transition: color .18s linear;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .1rem;
  height: 2px;
  background: var(--lime);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s linear;
}

.nav-link:hover { color: var(--paper); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--lime); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-utility {
  display: flex;
  align-items: center;
  gap: .4rem;
  padding-left: clamp(.5rem, 1.6vw, 1.25rem);
  border-left: 1px solid var(--line);
}

.nav-chip {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .1em;
  color: var(--steel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .4rem .6rem;
  white-space: nowrap;
  transition: color .18s linear, border-color .18s linear, background .18s linear;
}

.nav-chip:hover,
.nav-chip:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
  background: var(--lime-ghost);
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3.5rem, 8vw, 7rem);
  background:
    linear-gradient(180deg, rgba(14, 42, 35, .92) 0%, rgba(7, 27, 22, 1) 72%),
    var(--ink);
  border-top: 1px solid var(--line);
  color: var(--paper);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(140, 154, 148, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(140, 154, 148, .07) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(130% 95% at 50% 0, #000 0%, transparent 78%);
  mask-image: radial-gradient(130% 95% at 50% 0, #000 0%, transparent 78%);
}

.footer-top {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: clamp(2rem, 5vw, 5rem);
  padding-block: clamp(2.5rem, 5vw, 4.5rem) clamp(2rem, 4vw, 3rem);
}

.footer-brand { display: block; }

.brand--footer .brand-mark {
  width: 40px;
  height: 40px;
  font-size: 1rem;
}

.footer-note {
  margin-top: 1.15rem;
  max-width: 30ch;
  font-size: var(--fs-note);
  line-height: 1.8;
  color: var(--paper-70);
}

.footer-old {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin-top: 1.35rem;
  padding: .5rem .75rem;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .1em;
  color: var(--steel);
  transition: color .18s linear, border-color .18s linear, background .18s linear;
}

.footer-old:hover,
.footer-old:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
  background: var(--lime-ghost);
}

.footer-old-icon {
  display: inline-grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: .7rem;
  line-height: 1;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1rem, 2.6vw, 2rem);
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--lime-dark);
  padding-bottom: .7rem;
  margin-bottom: .85rem;
  border-bottom: 1px solid var(--line-soft);
}

.footer-list { display: flex; flex-direction: column; gap: .55rem; }

.footer-list a {
  font-size: .875rem;
  color: var(--paper-70);
  transition: color .18s linear, padding-left .18s var(--ease);
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: var(--lime);
  padding-left: .3rem;
}

.footer-meta {
  position: relative;
  border-top: 1px solid var(--line);
  padding-block: clamp(1.5rem, 3vw, 2.25rem) clamp(1.25rem, 2.5vw, 1.75rem);
}

.footer-meta-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: clamp(1.5rem, 3vw, 3rem);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: .5rem 1.4rem;
}

.footer-legal a {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--steel);
  border-bottom: 1px solid transparent;
  transition: color .18s linear, border-color .18s linear;
}

.footer-legal a:hover,
.footer-legal a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  min-width: min(100%, 320px);
}

.contact-line {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .6rem;
  font-size: var(--fs-note);
}

.contact-line--static { color: var(--paper-70); }

.contact-label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .18em;
  color: var(--steel);
  min-width: 2.9rem;
}

.contact-value {
  font-size: var(--fs-note);
  color: var(--paper);
  word-break: break-word;
}

.copy-btn {
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .14em;
  padding: .22rem .48rem;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--steel);
  cursor: pointer;
  transition: color .18s linear, border-color .18s linear, background .18s linear;
}

.copy-btn:hover,
.copy-btn:focus-visible,
.copy-btn.is-done {
  color: var(--lime);
  border-color: var(--lime);
  background: var(--lime-ghost);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .75rem;
  margin-top: clamp(1.25rem, 2.5vw, 2rem);
  padding-top: 1rem;
  border-top: 1px solid var(--line-soft);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .12em;
  color: var(--steel);
}

.footer-copy--mono { letter-spacing: .16em; color: rgba(140, 154, 148, .75); }

/* ---------- 8. 按钮 / 胶囊 / 标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .8rem 1.35rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .14em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .18s linear, color .18s linear, border-color .18s linear, transform .18s var(--ease);
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--ice);
  border-color: var(--ice);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--paper);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .12em;
  padding: .35rem .6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--steel);
  background: transparent;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .12em;
  padding: .45rem .75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--steel);
  cursor: pointer;
  transition: color .18s linear, border-color .18s linear, background .18s linear;
}

.filter-btn:hover { color: var(--paper); border-color: var(--paper-70); }

.filter-btn[aria-pressed="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
}

/* ---------- 9. 面包屑 / 正文容器 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  padding-block: 1.15rem 0;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .12em;
  color: var(--steel);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
}

.breadcrumb li + li::before {
  content: "/";
  color: rgba(140, 154, 148, .45);
}

.breadcrumb a { color: var(--steel); transition: color .18s linear; }
.breadcrumb a:hover { color: var(--lime); }
.breadcrumb [aria-current="page"] { color: var(--paper); }

.page-main {
  position: relative;
  display: block;
}

.prose {
  max-width: 68ch;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: rgba(242, 246, 241, .86);
}

.prose > * + * { margin-top: 1.15em; }

.prose h2 {
  font-size: var(--fs-h3);
  letter-spacing: .08em;
  color: var(--paper);
  margin-top: 2em;
}

.prose h3 {
  font-size: 1.05rem;
  letter-spacing: .08em;
  color: var(--paper);
  margin-top: 1.6em;
}

.prose a {
  color: var(--ice);
  border-bottom: 1px solid rgba(89, 224, 200, .4);
  transition: border-color .18s linear;
}

.prose a:hover { border-bottom-color: var(--ice); }

.prose ul, .prose ol { padding-left: 1.2rem; }

.prose ul li { list-style: none; position: relative; }

.prose ul li::before {
  content: "";
  position: absolute;
  left: -1rem;
  top: .78em;
  width: 6px;
  height: 1.5px;
  background: var(--lime-dark);
}

.prose ol { list-style: decimal; }

.prose blockquote {
  border-left: 2px solid var(--lime-dark);
  padding-left: 1.1rem;
  color: var(--paper-70);
}

/* ---------- 10. 章节抬头 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--lime);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 2rem;
  margin-bottom: clamp(1.25rem, 2.5vw, 2rem);
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.section-title {
  font-size: var(--fs-h2);
  letter-spacing: .08em;
  color: var(--paper);
}

.section-note {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .12em;
  color: var(--steel);
  max-width: 42ch;
  line-height: 1.7;
}

/* ---------- 11. 面板 / 提示 ---------- */
.panel {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.1rem, 2.2vw, 1.75rem);
}

.data-panel {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.1rem, 2.4vw, 1.9rem);
}

.data-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 44px;
  height: 2px;
  background: var(--lime);
}

.notice {
  background: rgba(255, 155, 74, .08);
  border-left: 2px solid var(--orange);
  padding: .9rem 1.15rem;
  font-size: var(--fs-note);
  line-height: 1.75;
  color: var(--paper-70);
}

/* ---------- 12. 图片容器（页面阶段放占位/实图） ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--ink-3);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  isolation: isolate;
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(184, 255, 61, 0);
  transition: border-color .18s linear;
  pointer-events: none;
  z-index: 2;
}

.media:hover::after { border-color: rgba(184, 255, 61, .55); }

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.72) contrast(1.06) brightness(.92);
}

.media__badge {
  position: absolute;
  top: .6rem;
  left: .6rem;
  z-index: 3;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .12em;
  padding: .22rem .5rem;
  background: var(--lime);
  color: var(--ink);
  border-radius: var(--radius);
}

.media-caption {
  margin-top: .6rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: .1em;
  color: var(--steel);
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }

/* ---------- 13. 动效 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--lime), var(--ice));
  z-index: 200;
  pointer-events: none;
}

.has-js .reveal {
  opacity: 0;
  transform: translateY(14px);
}

.has-js .reveal.is-in {
  opacity: 1;
  transform: none;
  transition: opacity .45s var(--ease), transform .45s var(--ease);
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1180px) and (min-width: 961px) {
  .nav-utility { display: none; }
}

@media (max-width: 960px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 88;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 1.1rem var(--gutter) 2rem;
    background: var(--ink-2);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 26px 52px rgba(0, 0, 0, .55);
    max-height: calc(100vh - 4.5rem);
    overflow-y: auto;
  }

  .site-nav[data-open] { display: flex; animation: navDrop .22s var(--ease); }

  @keyframes navDrop {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: none; }
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    counter-reset: navidx;
  }

  .nav-list > li {
    counter-increment: navidx;
    border-bottom: 1px solid var(--line-soft);
  }

  .nav-link {
    display: flex;
    align-items: center;
    gap: .9rem;
    padding: .95rem 0;
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: .06em;
  }

  .nav-link::before {
    content: counter(navidx, decimal-leading-zero);
    font-family: var(--font-mono);
    font-size: .7rem;
    letter-spacing: .1em;
    color: var(--lime-dark);
  }

  .nav-link::after { display: none; }

  .nav-utility {
    flex-wrap: wrap;
    border-left: 0;
    border-top: 1px solid var(--line);
    margin-top: 1.25rem;
    padding: 1rem 0 0;
  }

  .grid--2,
  .grid--3,
  .grid--4,
  .grid--split { grid-template-columns: minmax(0, 1fr); }

  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-note { max-width: 46ch; }
}

@media (max-width: 720px) {
  .header-bar { min-height: 66px; }
  .brand-mark { width: 38px; height: 38px; font-size: 1rem; }
  .brand-name { font-size: .95rem; letter-spacing: .12em; }
  .brand-sub { font-size: .5rem; letter-spacing: .24em; }
  .ticker-item--right { display: none; }
  .footer-cols { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
  .footer-meta-grid { flex-direction: column; }
  .footer-base { flex-direction: column; }
}

@media (max-width: 420px) {
  .nav-toggle-text { display: none; }
  .ticker-item--mono { display: none; }
}

/* ---------- 15. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .has-js .reveal { opacity: 1; transform: none; }
  .dot--live { animation: none; box-shadow: none; }
  .site-nav[data-open] { animation: none; }
  .scroll-progress { display: none; }
}